/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.ignite.spi.communication.tcp.internal;

import java.util.concurrent.atomic.AtomicInteger;

/**
 * Round robin connection policy.
 */
public class RoundRobinConnectionPolicy implements ConnectionPolicy {
    /** Maximal connections number. */
    private final int cnt;

    /** */
    private final AtomicInteger counter = new AtomicInteger();

    /**
     * @param cnt Maximal connections number.
     */
    public RoundRobinConnectionPolicy(int cnt) {
        this.cnt = cnt;
    }

    /** {@inheritDoc} */
    @Override public int connectionIndex() {
        int idx = counter.getAndIncrement() % cnt;

        if (idx < 0)
            idx += cnt;

        return idx;
    }
}
